It is known that the diameter is twice the radius so it follows:
[tex]D=2r[/tex]
1. For r=3 feet, the diameter is given by:
[tex]D=2(3)=6[/tex]
Hence the diameter is 6 feet.
2. For r=11 cm the diameter is given by:
[tex]D=2(11)=22[/tex]
Hence the diameter is 22 feet.
